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Afina-wow [57]
3 years ago
11

A soccer league has 170 players. Of those players 40% are boys. How many boys are in the soccer league?

Mathematics
2 answers:
Greeley [361]3 years ago
5 0
170×.4=68
170-68=102
102 are boys
asambeis [7]3 years ago
5 0
= 170 x 40%
= 170 x 0.4
= 68
170 - 68 = 102 boys
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IRINA_888 [86]

Answer: A. The number 23 is prime, but 36 is composite.

=====================================================

Explanation:

Let's go through the possible answer choices

  • A) This is true because 23 only has the factors 1 and 23. So that's why 23 is prime. We can say 36 is composite since 2 is a factor, ie 36 = 2*18.
  • B) This is false because 33 is not prime. Note how 33 = 3*11, showing that 3 is a factor of 33.
  • C) Similar to B, the statement "21 is prime" is false. Note how 21 = 3*7.
  • D) Like the other false statements, 27 is not prime because 27 = 3*9.

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3 years ago
What is the derivative of x^3
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3 years ago
If y=2-3x/x+3 express x in terms of y<br> [20pts]
ollegr [7]

Answer:

  a. x = (2 -3y)/(y+3)

  b. x = -4/5

Step-by-step explanation:

<h3>a.</h3>

Clear the fraction, collect x terms, divide by the coefficient of x.

  y=\dfrac{2-3x}{x+3}\\\\y(x+3)=2-3x\\\\3x+xy=2-3y\qquad\text{add $3x-3y$}\\\\x(y+3)=2-3y\qquad\text{factor out x}\\\\\boxed{x=\dfrac{2-3y}{y+3}}\qquad\text{divide by the coefficient of x}

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<h3>b.</h3>

Put 2 where y is and do the arithmetic.

  x = (2 -3(2))/(2 +3) = (2 -6)/5

  x = -4/5

6 0
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8_murik_8 [283]

Answer:

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We know that, formula for number of samples is,

n= \frac{z^2 \times p \times q}{SE^2}

When nothing is given, we take p=0.5 and we know that q = 1-p=0.5.

SE = 0.03 (the true proportion should remain withing 3%)

Putting the values we get,

n= \frac{(2.33)^2 \times 0.5 \times 0.5}{(0.03)^2}

n= \frac{5.4289 \times 0.5 \times 0.5}{0.03 \times 0.03} \approx 1509


Therefore, the sample required to estimate the true proportion to within 3 percentage points is 1509.

7 0
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4 years ago
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